[PBXContainerItemProxy] Make also container_portal a weak reference.

lib/xcodeproj/project/object/container_item_proxy.rb

@@ -8,24 +8,30 @@ module Object
       # This class is referenced by {PBXTargetDependency}; for information
       # about it usage see the specs of that class.
       #
+      # @note This class references the other objects by uuid instead of
+      #       creating proper relationships because the other objects might be
+      #       part of another project. This implies that the references to
+      #       other objects should not increase the retain coutn of the
+      #       targets.
+      #
       # @todo: this class needs some work to support targets accross workspaces,
       #        as the container portal might not be initialized leading
       #        xcodproj to raise because ti can't find the UUID.
       #
       class PBXContainerItemProxy < AbstractObject
 
-        # @return [PBXProject] apparently the root object of the project
-        #   containing the represented object.
+        # @return [String] apparently the UUID of the root object
+        #   {PBXProject} of the project containing the represented object.
         #
-        has_one :container_portal, PBXProject
+        attribute :container_portal, String
 
         # @return [String] the type of the proxy.
         #
         # - {PBXNativeTarget} is `1`.
         #
         attribute :proxy_type, String
 
-        # @return [AbstractObject] apparently the UUID of the represented
+        # @return [String] apparently the UUID of the represented
         #   object.
         #
         # @note If the object is in another project this will return nil.

spec/project/object/configuration_list_spec.rb

@@ -7,7 +7,7 @@ module ProjectSpecs
       @list = @project.new(XCConfigurationList)
     end
 
-    it "by the default the default configutation is not visible" do
+    it "by the default the default configuration is not visible" do
       @list.default_configuration_is_visible.should == '0'
     end
 

spec/project/object/container_item_proxy_spec.rb

@@ -8,8 +8,8 @@ module ProjectSpecs
     end
 
     it "returns the container portal" do
-      @proxy.container_portal = @project.root_object
-      @proxy.container_portal.should == @project.root_object
+      @proxy.container_portal = @project.root_object.uuid
+      @proxy.container_portal.should == @project.root_object.uuid
     end
 
     it "returns the type of the proxy" do

spec/project/object/target_dependency_spec.rb

@@ -16,7 +16,7 @@ module ProjectSpecs
       target = @project.new_target(:static, "Pods", :ios)
 
       proxy = @project.new(PBXContainerItemProxy)
-      proxy.container_portal = @project.root_object
+      proxy.container_portal = @project.root_object.uuid
       proxy.remote_info = "Pods"
       proxy.proxy_type = "1"
       proxy.remote_global_id_string = target.uuid